How To Identify Mysterious Radio Signals

I uncovered a mysterious radio signal on 72MHz and wanted to figure out what it was. The signal was obviously digital and using BPSK, but I’ve never seen a signal like this before. Watch and see how I found it where and what it was!
I used the FCC ULS database and Sigidwiki to track down and identify the source and understand what I was hearing.
#HamRadio #Radio #RadioFrequency
Links and resources
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📃 FCC ULS Database: www.fcc.gov/wireless/universa...
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Chapters
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0:00 How to Identify Radio Signals
1:00 What’s on 72 MHz?
1:30 The Signal on SDR
1:56 Using the FCC ULS Database
3:26 Using Sigidwiki.com
5:01 Looking at the Transmitter

[@thed8229]

Woah! You just gave me something new to do. Headed straight to my shack to look for weird stuff.

[@zacki5663]

A "Radio Shack"?

[@ke6igz]

One time a friend and I drove all over trying to find a interfering signal. Turns out it was coming from the car we were in.

[@K0LWC]

How did you realize it was the car!?

[@ke6igz]

@@K0LWC after driving all over we could not seem to locate it. We had a loop antenna. We finally pulled over and disconnected the car battery from the car. It disappeared.

[@K0LWC]

@@ke6igz Oh man, I would probably just scream…then laugh.

[@erikpoephoofd]

Interesting. Spark plugs seem a logical radio source. What part of the car do you think it was?

[@GroundControl204]

How many dumb hams does it take to find a signal? Lmfao

[@justincase3880]

72MHz FM was RC Airplanes .. 75 MHz was RC cars & boats .. most, if not all RC hobbyists have now moved on to 2.4 GHz spread spectrum …

[@K0LWC]

It seems many of the devices have all moved on to higher frequencies. I know many microphone systems are now in the 200MHz range.

[@shadowmaster9780]

Yeap yeap, I got one of those old 72 mhz futaba radio transmitter. But no this signal isnt an rc radio transmission!

[@Lugeix]

Primex Clock Transmitter. I repair them at work.

[@NimblyJimbly]

Great process. Have been working my way through your videos after subscribing a while back. Really enjoying your channel.

[@dean5263]

Thanks for the video, you have shown the greatest resources I knew of for finding this type of information, Good to see HDSDR working in somebody else radio room too.

[@Danyulesun]

Hey Thanks for posting this ! I often come across weird signals and wonder what and were they are so this is really helpful! Excellent video with very handy info!! Cheers Daniel.

[@DonzLockz]

Great info, thank you!👍

[@jeremyhahn5298]

Very helpful video, Matt. Thanks as always.

[@K0LWC]

You’re welcome, glad you enjoyed it!

[@jroosh]

Well done John NG0Z

[@k4bth]

Interesting video. Thanks for sharing!

[@K0LWC]

Thanks so much, Brad!

[@Nikonman77]

Sir… I’m finding signals on the scope that seem to follow my centerline frequency indicator on my waterfall or scope and follows other signals around some people call them sharks and all kinds of other stupid names. I’m finding these signals scanning other people signals and following and scanning seems like my radio. I see these a lot, and I don’t see any explanation for I’m on the Internet.

[@arijitkumarhaldar3197]

I once found someone talking in codes...Send the Jupiter to chilli building, etc etc on FM modulation...way high up than the legal UHF frequencies for Amateur radio...but within reach of Baofeng handhelds. I have no idea what that was. But I was intrigued.

[@veerbhogyavasundhra6056]

That's a classic code from CPI (maoist ) Jupiter = person which was on radio Chilli = ammunition I have been listening to these naxals for way long Recently even a smuggling was busted I will link the video of that kzbin.info/www/bejne/oHXZl3WAhtV1aJI This man was relocating for treatment when he was caught

[@mrshankj5101]

Shortwave radio is awesome and fun!

[@K0LWC]

While this isn’t shortwave in the video, I agree! I love tuning around and seeing what I can identify.

[@KI4ASK]

Very cool

[@K0LWC]

Thanks, Joe!

[@Davidjb37721]

Thanks

[@K0LWC]

You’re welcome, David.

[@mooseworx5595]

What SDR software is this?

[@K0LWC]

HDSDR

[@ShainAndrews]

You ask a question... get a response... and can't be bothered to thank the person for their time, information, anything.

[@keesvanoosbree5911]

Wow, I need to check that out! 73 de W0AAE

[@K0LWC]

Let me know if you’re hearing it!

[@keesvanoosbree5911]

@@K0LWC I almost thought it was my school, since we used synchronized clocks as you were showing, but the address is wrong... It would have been cool, though. LOL.

[@K0LWC]

@@keesvanoosbree5911 I want to take my HT and confirm it’s not Basswood, that was my first thought. It’s possible that the ULS license for MG public schools could be another zip and not picked up in the search. We had these same clocks when I was in school.

[@budude]

First

[@K0LWC]

By mere minutes!